Yanmar 3TNV Series Service Manual page 81

4. Disassembly, Inspection and Reassembly of Engines
Step
1) Disconnect coolant water pipe from the
cooling water pump.
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2) Remove thermostat assembly.
3) Remove cooling water pump.
1) Remove cylinder head tightening bolt.
2) Remove cylinder head assembly.
3) Remove cylinder head gasket.
10
1) Remove crankshaft V-pulley clamping bolt.
2) Using a puller, extract crankshaft V-pulley.
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1) Remove oil pan mounting bolt under gear
case.
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2) Remove gear case mounting bolt.
3) Remove gear case.
1) Remove the nut from fuel injection pump
drive gear. Extract fuel injection pump drive
gear using a puller.
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Removal Parts
1) Lay a cardboard or the like on the floor and
place cylinder head assembly on it so as not
to damage the combustion surface.
2) Order of loosening the cylinder head
tightening bolts.
3) To remove the intake/exhaust valves from
cylinder head assembly, take the following
steps.
a) Using a valve spring compressor (see
Chapter 5, 5-1), compress valve spring and
remove valve cotter.
b) Remove valve retainer and valve spring.
c) Remove intake valve and exhaust valve.
1) Extract crankshaft V-pulley by hitting the bolt
of the puller using a plastic hammer or the
like.
1) Never fail to removes stiffner bolt at the
center of the gear case.
2) When removing the gear case, carefully
protect oil seal from damage.
1) Before removing fuel injection pump, make
sure of the position of the arrow of the pump
body for adjusting fuel injection timing as well
as the position of the scribed line of the gear
case flange. (Applies only to direct injection
system.)
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Remarks